STMicroelectronics LF351D

Overview

LF351D from STMicroelectronics is a wide-bandwidth, JFET-input single operational amplifier optimized for precision analog signal conditioning in industrial and test equipment. It delivers 16 V/µs slew rate, ±15 V input voltage range, 2.5–4 MHz gain-bandwidth product, and 10¹² Ω input resistance - enabling high-fidelity amplification of low-level sensor signals in DC-coupled instrumentation circuits.

For engineers reviewing the LF351D datasheet, LF351D pinout, LF351D application, or LF351D equivalent, key selection criteria include input offset drift (10 µV/°C), output short-circuit protection, internal frequency compensation, and SO-8 package compatibility with space-constrained PCB layouts requiring low-input-bias-current performance.

Technical Context

The LF351D employs a monolithic JFET-bipolar hybrid process to achieve high input impedance and low input bias current while maintaining stable unity-gain operation via internal frequency compensation. Its input stage supports common-mode voltages up to VCC+, and its output stage includes short-circuit protection with infinite duration rating under thermal limits.

It operates across ±6 V to ±18 V supply rails, with guaranteed performance over 0°C to +70°C ambient temperature. The device features latch-up-free architecture and ESD robustness (500 V HBM), making it suitable for non-automotive industrial environments where reliability under transient stress is critical.

Key Specifications

Pinout & Package

LF351D is housed in an SO-8 plastic micro package (3.9 × 4.9 mm, 1.27 mm pitch), compliant with ECOPACK® lead-free interconnect standards and JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar JFET-input op-amp applications.

Compared with TLC27L1CD and TL071CP, the LF351D uniquely combines adjustable offset nulling, industrial-grade slew rate, and SO-8 packaging - making it optimal for cost-sensitive, medium-speed precision analog stages where DC accuracy and layout simplicity are prioritized over ultra-low power or extended temperature range.

Availability

LF351D is available at Aetrix Electronics and suitable for industrial test equipment, portable instrumentation, analog filter modules, and sensor interface circuits requiring stable component supply across multi-year production cycles.

Supply support for LF351D includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

The LF351D belongs to ST's legacy JFET-input op-amp family, engineered specifically for general-purpose precision analog signal processing where high input impedance, moderate speed, and DC stability outweigh ultra-low-power or automotive qualification needs.

FAQ

What is the maximum recommended supply voltage for LF351D?

The absolute maximum supply voltage is ±18 V, but continuous operation above ±15 V increases junction temperature and may reduce long-term reliability. For stable 0°C to +70°C operation, ST specifies ±15 V as the standard test condition and recommends staying within this range unless thermal derating is applied per the 125 °C/W SO-8 thermal resistance value.

Can LF351D drive capacitive loads directly?

LF351D is internally compensated for unity-gain stability with resistive loads, but driving >100 pF capacitive loads risks peaking or oscillation. For capacitive loads exceeding 100 pF, a series isolation resistor (typically 10–100 Ω) must be placed between the output pin and the load capacitance to maintain phase margin above 45°.

How do I adjust input offset voltage using Pins 1 and 5?

Connect a 10 kΩ potentiometer between Pins 1 and 5, with its wiper tied to VCC−. Adjusting the wiper changes the current balance in the input differential pair, reducing input offset voltage to <1 mV. Use low-tempco metal-film pots and keep traces short to avoid noise pickup on the nulling path.

Is LF351D suitable for single-supply operation?

LF351D supports single-supply operation only if the input common-mode range includes the desired signal range - e.g., with VCC+ = +15 V and VCC− = 0 V, the input can accept signals from –12 V to +15 V, but output swing is limited to ~0.5 V above ground and ~12 V below VCC+. For true rail-to-rail input/output, a modern rail-to-rail op-amp is required.